Helical elastic cylindrical pin preloading tool

Abstract

The utility model discloses a spiral elastic cylindrical pin preloading tool, including connecting rod, the coaxial sleeve of handle is equipped with on the outside wall of connecting rod, and connecting rod is connected through cylindrical pin and knock head, and the coaxial sleeve of handle upper end surface and knock head section lower end surface is equipped with protective pad between, connecting rod still is connected through a plurality of shaft shoulder bolts and sleeve head, and the outside wall of shaft shoulder bolt is equipped with compression spring, the vertical coaxial through hole of bottom wall center is seted up in sleeve head, and the inner surface of bottom wall of sleeve head is provided with O type ring, and O type ring and guide hole are used for clamping spiral elastic cylindrical pin, the detachable limit block of upper end surface is seted up on sleeve head, and the error of spiral elastic cylindrical pin extension length can be ensured by limit block no more than 0.2mm. The spiral elastic cylindrical pin preloading tool put forward by the utility model realizes mechanical limiting through limit block and sleeve head cooperation, ensures that the error of spiral elastic cylindrical pin extension length no more than 0.2mm, eliminates the error of manual adjustment, and remarkably improves assembly accuracy.

Description

Technical Field

[0001] This utility model belongs to the field of vehicle technology, and relates to cylindrical pins, specifically to a pre-assembly tooling for a helical elastic cylindrical pin. Background Technology

[0002] The existing hydraulic retarder screw pump uses a helical elastic cylindrical pin for anti-loosening. Its structure is as follows: the screw pump and spline shaft are connected by an interference fit, and the elastic cylindrical pin is also interference-fitted with both. During assembly, the helical elastic cylindrical pin must first be pre-installed on the screw pump. The screw pump stop and the helical elastic cylindrical pin are aligned with the mounting holes on the spline shaft head and end face, respectively. Then, a press is used to press the helical elastic cylindrical pin and screw pump into place. The pre-installation of the helical elastic cylindrical pin has stringent requirements: the helical elastic cylindrical pin must extend 8mm beyond the lower end face of the screw pump; the end face of the helical elastic cylindrical pin must not be flattened or flanged; and the surface of the screw pump parts must not be damaged.

[0003] Currently, the traditional pre-installation method for helical elastic cylindrical pins is manual hammering, which has the following problems: a. Poor positioning accuracy: Without a mechanical limiting structure, the extension length of the helical elastic cylindrical pin is difficult to control, requiring repeated adjustments 2-3 times, resulting in low assembly efficiency; b. Unstable quality: Manual operation easily causes the helical elastic cylindrical pin to tilt, resulting in flattened or folded end faces. Additionally, the large hammer head can easily damage the helical pump, leading to part scrap; c. High safety risk: Operators must hold the cylindrical pin for pre-positioning, posing a risk of hand injury from the hammer; d. High labor intensity: The entire pre-installation process relies entirely on repeated manual hammering and adjustments, resulting in high labor intensity. Therefore, there is an urgent need to develop a pre-installation fixture that can accurately position, control the pre-installation depth, and ensure operational safety. Summary of the Invention

[0004] To address the shortcomings of existing technologies, this utility model proposes a helical elastic cylindrical pin pre-assembly fixture to solve the technical problems of inaccurate positioning and inability to control pre-assembly depth in existing technologies.

[0005] To solve the above-mentioned technical problems, the present invention adopts the following technical solution: A pre-assembly fixture for a helical elastic cylindrical pin includes a connecting rod. The connecting rod comprises a large cylindrical end, a connecting cylindrical end, and a small cylindrical end that are coaxially connected from top to bottom. A hammer head mounting hole is vertically and coaxially formed at the center of the upper end face of the large cylindrical end. A first cylindrical pin mounting hole is horizontally formed on the large cylindrical end. The first cylindrical pin mounting hole and the hammer head mounting hole are connected. A handle is coaxially fitted on the outer side wall of the large cylindrical end.

[0006] It also includes a striking head, which consists of a striking head section, a striking head connecting section, and a large cylindrical end mounting section connected coaxially from top to bottom. The large cylindrical end mounting section has a horizontally extending second cylindrical pin mounting hole. The second cylindrical pin mounting hole and the first cylindrical pin mounting hole are correspondingly opened, and cylindrical pins are installed in the second cylindrical pin mounting hole and the first cylindrical pin mounting hole, so that the large cylindrical end mounting section is fixedly installed in the striking head mounting hole.

[0007] A protective pad is coaxially fitted between the upper end face of the handle and the lower end face of the striking head section.

[0008] It also includes a sleeve, which consists of a sleeve connecting section and a small cylindrical end mounting section connected coaxially from top to bottom. The sleeve connecting section has a first small cylindrical end mounting hole vertically coaxially opened at the center, and the small cylindrical end mounting section has a second small cylindrical end mounting hole vertically coaxially opened at the center. The first and second small cylindrical end mounting holes are used for movably mounting the small cylindrical end.

[0009] The bottom wall of the small cylindrical end mounting section has a vertically coaxially through guide hole at its center, and an O-ring is provided on the inner surface of the bottom wall of the small cylindrical end mounting section. The O-ring and the guide hole are used to clamp the spiral elastic cylindrical pin.

[0010] The sleeve connecting section is connected to the connecting cylindrical end by multiple shoulder bolts. A compression spring is fitted on the outer wall of the shoulder bolt. The compression spring causes the small cylindrical end to move up and down within the first small cylindrical end mounting hole and the second small cylindrical end mounting hole.

[0011] A limiting block is detachably provided on the upper end face of the sleeve connecting section, and the limiting block is located between the lower end face of the connecting cylindrical end and the upper end face of the sleeve connecting section.

[0012] This utility model also has the following technical features: The outer diameter of the large cylindrical end is smaller than the outer diameter of the connecting cylindrical end, the outer diameter of the large cylindrical end is larger than the outer diameter of the small cylindrical end, the height of the large cylindrical end is greater than the height of the small cylindrical end, and the height of the small cylindrical end is greater than the height of the connecting cylindrical end.

[0013] The outer diameter of the striking head section is larger than the outer diameter of the striking head connecting section, the outer diameter of the striking head connecting section is equal to the outer diameter of the large cylindrical end, and the outer diameter of the large cylindrical end mounting section is equal to the inner diameter of the striking head mounting hole.

[0014] The second cylindrical pin mounting hole is interference-fitted with the cylindrical pin, and the first cylindrical pin mounting hole is clearance-fitted with the cylindrical pin, so that the large cylindrical end mounting section is fixedly installed in the hammer head mounting hole.

[0015] The first and second small cylindrical end mounting holes have the same inner diameter, are connected, and the inner diameter of the guide hole is smaller than that of the second small cylindrical end mounting hole.

[0016] The number of shoulder bolts is four, and the four shoulder bolts are distributed in a cross-shaped symmetrical arrangement.

[0017] Compared with the prior art, the present invention has the following beneficial technical effects: (I) The pre-assembly fixture for the spiral elastic cylindrical pin proposed in this utility model achieves mechanical limiting through the cooperation of the limiting block and the sleeve, ensuring that the error of the extension length of the spiral elastic cylindrical pin is no more than 0.2mm, eliminating the error caused by manual adjustment, and significantly improving the assembly accuracy.

[0018] (II) The pre-installation fixture for the spiral elastic cylindrical pin proposed in this utility model ensures the perpendicularity of the spiral elastic cylindrical pin during the pre-installation process through the guide hole and O-ring, effectively avoiding the problem of deformation of the end face of the spiral elastic cylindrical pin. At the same time, the hammer is used to install the striking head, avoiding the problem of damaging the spiral pump. The scrap rate of parts is greatly reduced, which greatly improves product quality and production efficiency.

[0019] (III) The spiral elastic cylindrical pin pre-installation fixture proposed in this utility model eliminates the need for operators to hold the cylindrical pin for positioning, while the protective pad can effectively prevent the hammer from accidentally hitting the hand, thus eliminating the safety risks during operation.

[0020] (IV) The spiral elastic cylindrical pin pre-assembly tooling proposed in this utility model can complete the precise positioning of the cylindrical pin in a single hammering. Compared with the traditional manual hammering method that requires multiple adjustments, the assembly efficiency is increased by more than 3 times, and the labor intensity is greatly reduced. Attached Figure Description

[0021] Figure 1 A schematic diagram of the overall structure of the pre-installation fixture for the spiral elastic cylindrical pin.

[0022] Figure 2 This is a schematic diagram showing the pre-assembly tooling for the spiral elastic cylindrical pin and the initial assembly of the spiral pump.

[0023] Figure 3 A schematic diagram showing the complete assembly of the spiral elastic cylindrical pin pre-assembly fixture with the spiral pump.

[0024] Figure 4 This is a structural diagram of the positioning base.

[0025] The meanings of the labels in the diagram are as follows: 1-connecting rod, 2-handle, 3-striking head, 4-cylindrical pin, 5-protective pad, 6-sleeve, 7-O-ring, 8-spiral elastic cylindrical pin, 9-shoulder bolt, 10-compression spring, 11-limit block, 12-positioning base, 13-spiral pump.

[0026] 101-Large cylindrical end, 102-Connecting cylindrical end, 103-Small cylindrical end, 104-Knocking head mounting hole, 105-First cylindrical pin mounting hole.

[0027] 301 - Striking head section, 302 - Striking head connecting section, 303 - Large cylindrical end mounting section, 304 - Second cylindrical pin mounting hole.

[0028] 601 - Sleeve connecting section, 602 - Small cylindrical end mounting section, 603 - First small cylindrical end mounting hole, 604 - Second small cylindrical end mounting hole, 605 - Guide hole.

[0029] The specific content of this utility model will be further explained in detail below with reference to the embodiments. Detailed Implementation

[0030] It should be noted that, unless otherwise specified, all devices and components in this utility model are based on devices and components known in the prior art.

[0031] Following the above technical solution, the following are specific embodiments of this utility model. It should be noted that this utility model is not limited to the following specific embodiments, and all equivalent modifications made based on the technical solution of this application fall within the protection scope of this utility model.

[0032] Example: This embodiment provides a pre-assembly fixture for a helical elastic cylindrical pin, including a connecting rod 1, as shown below. Figures 1 to 3 As shown, the connecting rod 1 includes a large cylindrical end 101, a connecting cylindrical end 102, and a small cylindrical end 103 connected coaxially from top to bottom. A striking head mounting hole 104 is vertically and coaxially opened at the center of the upper end face of the large cylindrical end 101. A first cylindrical pin mounting hole 105 is horizontally opened on the large cylindrical end 101. The first cylindrical pin mounting hole 105 and the striking head mounting hole 104 are connected. A handle 2 is coaxially fitted on the outer side wall of the large cylindrical end 101.

[0033] like Figures 1 to 3As shown, it also includes a striking head 3, which, from top to bottom, includes a striking head section 301, a striking head connecting section 302, and a large cylindrical end mounting section 303 connected coaxially. A second cylindrical pin mounting hole 304 is horizontally opened on the large cylindrical end mounting section 303. The second cylindrical pin mounting hole 304 and the first cylindrical pin mounting hole 105 are correspondingly opened. A cylindrical pin 4 is installed in the second cylindrical pin mounting hole 304 and the first cylindrical pin mounting hole 105, so that the large cylindrical end mounting section 303 is fixedly installed in the striking head mounting hole 104.

[0034] like Figures 1 to 3 As shown, a protective pad 5 is coaxially fitted between the upper end face of the handle 2 and the lower end face of the striking head section 301.

[0035] like Figures 1 to 3 As shown, it also includes a sleeve head 6. The sleeve head 6 includes a sleeve head connecting section 601 and a small cylindrical end mounting section 602 that are coaxially connected from top to bottom. The sleeve head connecting section 601 has a first small cylindrical end mounting hole 603 vertically coaxially opened at its center. The small cylindrical end mounting section 602 has a second small cylindrical end mounting hole 604 vertically coaxially opened at its center. The first small cylindrical end mounting hole 603 and the second small cylindrical end mounting hole 604 are used to movably mount the small cylindrical end 103.

[0036] like Figures 1 to 3 As shown, a through guide hole 605 is vertically coaxially opened at the center of the bottom wall of the small cylindrical end mounting section 602, and an O-ring 7 is provided on the inner surface of the bottom wall of the small cylindrical end mounting section 602. The O-ring 7 and the guide hole 605 are used to clamp the spiral elastic cylindrical pin 8.

[0037] like Figures 1 to 3 As shown, the sleeve connecting section 601 is connected to the connecting cylindrical end 102 by multiple shoulder bolts 9. A compression spring 10 is fitted on the outer wall of the shoulder bolt 9. The compression spring 10 causes the small cylindrical end 103 to move up and down within the first small cylindrical end mounting hole 603 and the second small cylindrical end mounting hole 604.

[0038] like Figures 1 to 3 As shown, a limiting block 11 is detachably provided on the upper end face of the sleeve connecting section 601. The limiting block 11 is located between the lower end face of the connecting cylindrical end 102 and the upper end face of the sleeve connecting section 601.

[0039] In this embodiment, the connection between the upper end face of the sleeve connecting section 601 and the limiting block 11 can be a detachable connection method commonly used in the art. The limiting block 11 can ensure that the error of the extended length of the spiral elastic cylindrical pin 8 is not greater than 0.2mm.

[0040] As a preferred embodiment of this invention, such as Figures 1 to 3As shown, the outer diameter of the large cylindrical end 101 is smaller than the outer diameter of the connecting cylindrical end 102, the outer diameter of the large cylindrical end 101 is larger than the outer diameter of the small cylindrical end 103, the height of the large cylindrical end 101 is greater than the height of the small cylindrical end 103, and the height of the small cylindrical end 103 is greater than the height of the connecting cylindrical end 102.

[0041] As a preferred embodiment of this invention, such as Figures 1 to 3 As shown, the outer diameter of the striking head section 301 is larger than the outer diameter of the striking head connecting section 302, the outer diameter of the striking head connecting section 302 is equal to the outer diameter of the large cylindrical end 101, and the outer diameter of the large cylindrical end mounting section 303 is equal to the inner diameter of the striking head mounting hole 104.

[0042] As a preferred embodiment, the second cylindrical pin mounting hole 304 is interference-fitted with the cylindrical pin 4, and the first cylindrical pin mounting hole 105 is clearance-fitted with the cylindrical pin 4, so that the large cylindrical end mounting section 303 is fixedly installed in the hammer head mounting hole 104.

[0043] As a preferred embodiment of this invention, such as Figures 1 to 3 As shown, the inner diameters of the first small cylindrical end mounting hole 603 and the second small cylindrical end mounting hole 604 are equal, the first small cylindrical end mounting hole 603 and the second small cylindrical end mounting hole 604 are connected, and the inner diameter of the guide hole 605 is smaller than the inner diameter of the second small cylindrical end mounting hole 604.

[0044] As a preferred embodiment, the number of shoulder bolts 9 is four, and the four shoulder bolts 9 are distributed in a cross-shaped symmetrical arrangement.

[0045] In this preferred embodiment, the handle 2 facilitates the operator's gripping of the pre-installed helical elastic cylindrical pin fixture, and the protective pad 5 prevents the hammer from accidentally striking the hand.

[0046] In this preferred embodiment, the limiting block 11 can be replaced as needed. The limiting block 11 limits the relative displacement between the sleeve head 6 and the connecting rod 1, thereby precisely controlling the pre-installation depth of the helical elastic cylindrical pin 8.

[0047] In this embodiment, the working process of the helical elastic cylindrical pin pre-assembly fixture is as follows: Step 1, Assembly Preparation: Place the positioning base 12 on a flat and stable workbench, such as Figure 4 As shown, the screw pump 13 is then placed stably on the positioning base 12, ensuring that the screw pump 13 is in a horizontal position. Step 2, positioning with a spiral elastic cylindrical pin: Insert the spiral elastic cylindrical pin 8 into the guide hole 605. Use the elastic clamping force of the O-ring 7 to hold the spiral elastic cylindrical pin 8 in the guide hole 605 to prevent the spiral elastic cylindrical pin 8 from falling off in subsequent operations. Step 3: Align the screw pump mounting holes: The operator holds handle 2 and aligns the spiral elastic cylindrical pin 8 with the mounting hole on the spiral pump 13, such as... Figure 2 As shown, at the same time, ensure that the pre-installed helical elastic cylindrical pin fixture remains in a vertical state; Step 4, tapping operation: like Figure 3 As shown, when the hammer is used to strike the striking head section 301 of the striking head 3, the compression spring 10 is compressed and the small cylindrical end 103 of the connecting rod 1 pushes the spiral elastic cylindrical pin 8 to gradually press into the mounting hole of the spiral pump 13. Step 5, In-place Inspection: like Figure 3 As shown, when the connecting cylindrical end 102, the limiting block 11 and the striking head connecting section 302 are tightly fitted together, a crisp sound will be emitted, indicating that the spiral elastic cylindrical pin 8 is pre-installed in place and the length extending out of the lower end face of the spiral pump 13 is exactly 8mm. The operator can perform simple measurement by visual inspection or by using measuring tools. Step 6, disassemble the tooling: Remove the pre-installed helical elastic cylindrical pin fixture to complete the pre-installation, and then proceed with subsequent assembly operations such as interference fit with the splined shaft.

Claims

1. A pre-assembly fixture for a helical elastic cylindrical pin, comprising a connecting rod (1), characterized in that, The connecting rod (1) includes, from top to bottom, a large cylindrical end (101), a connecting cylindrical end (102), and a small cylindrical end (103) connected coaxially in sequence. A striking head mounting hole (104) is vertically and coaxially opened at the center of the upper end face of the large cylindrical end (101). A first cylindrical pin mounting hole (105) is horizontally opened on the large cylindrical end (101). The first cylindrical pin mounting hole (105) and the striking head mounting hole (104) are connected. A handle (2) is coaxially fitted on the outer side wall of the large cylindrical end (101). It also includes a striking head (3), which includes, from top to bottom, a striking head section (301), a striking head connecting section (302), and a large cylindrical end mounting section (303) connected coaxially. A second cylindrical pin mounting hole (304) is horizontally opened on the large cylindrical end mounting section (303). The second cylindrical pin mounting hole (304) and the first cylindrical pin mounting hole (105) are opened correspondingly. A cylindrical pin (4) is installed in the second cylindrical pin mounting hole (304) and the first cylindrical pin mounting hole (105), so that the large cylindrical end mounting section (303) is fixedly installed in the striking head mounting hole (104). A protective pad (5) is coaxially fitted between the upper end face of the handle (2) and the lower end face of the striking head section (301); It also includes a sleeve (6), which includes a sleeve connecting section (601) and a small cylindrical end mounting section (602) connected coaxially from top to bottom. The sleeve connecting section (601) has a first small cylindrical end mounting hole (603) vertically coaxially opened in the center, and the small cylindrical end mounting section (602) has a second small cylindrical end mounting hole (604) vertically coaxially opened in the center. The first small cylindrical end mounting hole (603) and the second small cylindrical end mounting hole (604) are used to movably mount the small cylindrical end (103). The bottom wall of the small cylindrical end mounting section (602) is vertically coaxially provided with a through guide hole (605), and an O-ring (7) is provided on the inner surface of the bottom wall of the small cylindrical end mounting section (602). The O-ring (7) and the guide hole (605) are used to clamp the spiral elastic cylindrical pin (8). The sleeve connecting section (601) is connected to the connecting cylindrical end (102) by multiple shoulder bolts (9). A compression spring (10) is fitted on the outer wall of the shoulder bolt (9). The compression spring (10) causes the small cylindrical end (103) to move up and down in the first small cylindrical end mounting hole (603) and the second small cylindrical end mounting hole (604). A limiting block (11) is detachably provided on the upper end face of the sleeve connecting section (601). The limiting block (11) is located between the lower end face of the connecting cylindrical end (102) and the upper end face of the sleeve connecting section (601).

2. The helical elastic cylindrical pin pre-assembly fixture as described in claim 1, characterized in that, The outer diameter of the large cylindrical end (101) is smaller than the outer diameter of the connecting cylindrical end (102), the outer diameter of the large cylindrical end (101) is larger than the outer diameter of the small cylindrical end (103), the height of the large cylindrical end (101) is greater than the height of the small cylindrical end (103), and the height of the small cylindrical end (103) is greater than the height of the connecting cylindrical end (102).

3. The helical elastic cylindrical pin pre-assembly fixture as described in claim 1, characterized in that, The outer diameter of the striking head section (301) is greater than the outer diameter of the striking head connecting section (302), the outer diameter of the striking head connecting section (302) is equal to the outer diameter of the large cylindrical end (101), and the outer diameter of the large cylindrical end mounting section (303) is equal to the inner diameter of the striking head mounting hole (104).

4. The helical elastic cylindrical pin pre-assembly fixture as described in claim 1, characterized in that, The second cylindrical pin mounting hole (304) is interference-fitted with the cylindrical pin (4), and the first cylindrical pin mounting hole (105) is clearance-fitted with the cylindrical pin (4), so that the large cylindrical end mounting section (303) is fixedly installed in the hammer head mounting hole (104).

5. The helical elastic cylindrical pin pre-assembly fixture as described in claim 1, characterized in that, The inner diameters of the first small cylindrical end mounting hole (603) and the second small cylindrical end mounting hole (604) are equal, the first small cylindrical end mounting hole (603) and the second small cylindrical end mounting hole (604) are connected, and the inner diameter of the guide hole (605) is smaller than the inner diameter of the second small cylindrical end mounting hole (604).

6. The helical elastic cylindrical pin pre-assembly fixture as described in claim 1, characterized in that, The number of shoulder bolts (9) is four, and the four shoulder bolts (9) are distributed in a cross-shaped symmetrical pattern.

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